Bhagavad Gita · 1.3

पश्यैतां पाण्डुपुत्राणामाचार्य महतीं चमूम्।व्यूढां द्रुपदपुत्रेण तव शिष्येण धीमता॥

paśhyaitāṁ pāṇḍu-putrāṇām āchārya mahatīṁ chamūm vyūḍhāṁ drupada-putreṇa tava śhiṣhyeṇa dhīmatā

O teacher, behold this mighty army of the sons of Pandu, arranged in battle formation by your own intelligent disciple, the son of Drupada.

— Bhagavad Gita 1.3

Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)